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Recognizing method of flaky or blocky prohibited articles, explosives or drugs

a technology of prohibited articles and recognition methods, applied in image analysis, image enhancement, instruments, etc., can solve the problems of too much waiting and analysis time, relatively long time delay, and difficult to locate the object quickly, so as to achieve the effect of less time delay

Active Publication Date: 2016-09-20
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention simplifies the process of extracting three-dimensional targets by reducing it to a problem of extracting two-dimensional targets. The technique involves analyzing tomogram data layer by layer, which eliminates the need for waiting for all the data to be collected. This analysis is done as soon as one tomogram is received, and the processing procedure is repeated for each tomogram. The amount of data to be analyzed is small, resulting in minimal time delay. The invention also allows for quicker identification of flaky targets by measuring their length and thickness. Overall, the invention is significantly different from previous methods.

Problems solved by technology

Therefore, this results in a period of waiting time.
In this way, this causes the following disadvantages: too much waiting and analyzing time, and relatively long time delay, due to too many tomogram data to be analyzed, huge amount of data is, and long time for analyzing after the last tomogram data are acquired.
This indirectly utilizes physical features that the flaky objects have a relatively thin thickness, and it is not convenient to set parameters thereof.
The cube background method has high complexity and large computing amount.
And further, when the flaky object is close to one blocky object, or has many pixels adjacent thereto, this method tends to become invalid and neglect some objects upon recognizing, since the pixels to be detected have little differences from the background pixels.

Method used

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  • Recognizing method of flaky or blocky prohibited articles, explosives or drugs
  • Recognizing method of flaky or blocky prohibited articles, explosives or drugs
  • Recognizing method of flaky or blocky prohibited articles, explosives or drugs

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first embodiment

[0039

[0040]In the first embodiment of the present invention, an item suspected to house a flaky prohibited article, is a luggage box. With referring to FIG. 1, if it is intended to make inspection and recognition of the luggage box so as to determine whether it contains the flaky prohibited articles, then the recognizing steps thereof are exemplified as follows:

[0041]1) tomogram data of the objects to be inspected for one tomogram are read in;

[0042]2) The tomogram data is pre-processed. The pre-processing method in particular comprises: threshold limit, smoothing and quantifying of the tomogram data. As shown in FIG. 2, after quantifying process, the recognized image shows out a long strip-shaped region at a left corner of a rectangular profile, and two rings at the bottom thereof. It can be apparent that the rectangular profile is a sectional profile of the luggage box, and the two rings are sectional profiles of two pulling bars of the luggage box. The long strip-shaped area is su...

second embodiment

[0057

[0058]In the second embodiment of the present invention, an item suspected to house a blocky prohibited article, is a luggage box. With referring to FIG. 6, if it is intended to make inspection and recognition of the luggage box so as to determine whether it contains the blocky prohibited articles, then the recognizing steps thereof are exampled as follows:

[0059]1) tomogram data of the objects to be inspected (for example, the luggage box) for one tomogram are read in;

[0060]2) Current tomogram data are pre-processed. The pre-processing method comprises: threshold limit, smoothing and quantifying of the tomogram data, or the like. As shown in FIG. 7, after quantifying process, the recognized image shows out a rectangular blocky region (which is gray white) at the left side of a rectangular profile, and two rings at the bottom thereof. It can be apparent that the rectangular profile is of a sectional profile of the luggage box, and the two rings are of sectional profiles of two p...

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Abstract

The present invention discloses recognizing methods of flaky or blocky prohibited articles, explosives or drugs. Specifically, the method for recognizing flaky prohibited articles, explosives or drugs comprises steps of: (1) reading in tomogram data of an object to be inspected for one tomogram; (2) pre-processing the tomogram data; (3) splitting the pre-processed tomogram data into a plurality of regions that have similar physical properties; (4) analyzing whether each of the split regions is a flaky region; (5) determining whether the flaky region recognized in the current tomogram can be merged with the flaky region detected from the previous tomogram, so as to form a flaky target; (6) determining whether each detected flaky target is complete or finished; (7) repeating steps (1)-(6) and processing each tomogram data layer by layer, until all of the tomogram data have been processed.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of priority under 35 U.S.C. Section 119 to Chinese Patent Application Serial No. 201310041293.3 filed Feb. 1, 2013, which application is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention generally relates to recognition methods of prohibited articles, explosives or drugs in computed tomogram imaging data, and more particularly, to recognition methods of flaky or blocky prohibited articles, explosives or drugs.[0004]2. Description of the Related Art[0005]Since 9-11 event of the United States, security inspection in aviation industry has become more and more concerned. CT technique based security inspection products have incomparable advancement, and significant property superiority. TSA mechanism of US contends that one important way for achieving safety inspection in airports is to employ CT apparatuses and inspection me...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06T7/40G01V5/00
CPCG06T7/40G01V5/005G01V5/226G06V20/52G06V2201/05G06F18/24G06T5/00G06T7/60G06T2207/10088G06T2207/20021G06T2207/20172G06T2207/30242
Inventor ZHANG, LIHUANG, QINGPINGSUN, YUNDALEI, LEITANG, ZHI
Owner TSINGHUA UNIV